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N0. 607,23l. Patented lulv I2, 1898. C. E. FOSTER.

ARTlFiCl AL TGBTH. (Application filed Mar. 19 1898.}

(N0 ModelJ UNITED STATES PATENT U FICE.

CHARLES FOSTER, or WASHINGTON, DISTRICT OF COLUMBIA, AssIeNoR To THE NATIONAL :rooTI-I coMPANY, or YORK. PENNSYLVANIA.

ARTIFICIAL TOOTH SPECIFICATION forming part of Letters Patent No. 607,231, dated July 12 1898.

Application filed hfarch 19, 1898. Serial 1N0- fi74,539 (N model l) i To all whom it may concern:

Be it known that I, CHARLES E. FOSTER, a

citizen of the United States, residing at Wash- V ington, in the District of Columbia, have in vented certain new and useful Improvements in Artificial Teeth, of which the following is .aspecificat-ion.

used. insuchcases, audit-is also desirable to It has been'common to provide artifioial dentures with openings extending to the rear or labial faces and to embed in the dentures platina rings or perforated disks or plates so arranged as to'receive the stems of pins made of silver or'base metal which are soldered to the anchoring-pieces and thereby secured to the dentures. It is of course exceedinglydesirable to reduce the amount of platina to be secure as extended a bearing longitudinally as possible for the pin, thereby to increase the extent of the anchorage. Further, it is desirable to secure the anchoring-piece in the denture so that it cannot pull out and so that stress upon the same will not have the effect of splitting or flaking 01f the porcelain at the back of the teeth. In order to secure these desirable results and obviate certain defects of prior constructions, I make the anchoring- .piece in the form of a clip, as fully set forth ing for the pin and a bettenbearing in the Fig. 1, embedded therein.

body of the denture. Fig. 3 is a transverse section of a tooth with the anchoring-piece, Fig. 4 is a section on the line (3 6, Fig. 5. Fig. 5 is a vertical longitudinal section of a part of a mold, illustrating the manner in which the anchoringpiece is applied in the manufacture of the tooth. Fig. 6 is a plan'view of thelowermo1d section The anchoring-piece A, Fig; 1, is made in the form of a clip from a fiat strip or sheet of metal bent around to an extent exceeding a half -circl.e. It is necessary that the clip should exceed a half-circle, first, because with less metal it gives a longer bearing for the pin which is inserted therein and soldered thereto, and, secondly, because it is-necessary in the -manufacture of teeth to have some means for supporting the clip while the body is applied in the mold. 1

For'instauce, in Figs. 5 and G, which-illus- .55

trate the' mold usually employed, there are shown two posts 3 3 (of whidh there may beany suitable number) projecting upward from the lower mold-section B, within the recess X thereof; and which posts serve to form Go in the body of the material which is pressed between the sections of the mold the openings m extending to the rear faces thereof. By

- making the clips A in extentless than a'complete circle, but greater than a half-circle, I

am enabled with a small amount of metal to applythc clips tethe postsB S, and theywill adhere to the same, so that when the body material is inserted between the sections B B of the mold and pressed therein as the secof atube, they would be objectionable fpr two reasons. In the first place the porhelaln shrinks greatly and contracts in baking, and as the tube does not shrink to a proportionate extent there is a certain amount of stress upon the porcelain which tends to cause the '8o same to crack easily under any strain; secondly, when the anchoring-piece is in'the form of a tube the latter cannot be made of any extended length, so as to secure an extended longitudinal bearing for the pin, without an objectionable increase of the cost. I

With the anchoring-piece made in the form of a clip consisting of. a. strip bent. tumors than a half-circle, but open at one side, the

clip may be increased very materially in length, while employing the same amount of metal which would be. used'for making a complete tube shorter in length, and a still greater length of bearing may be secured by providing the clip witha projection 4, extend- 5 ing longitudinally from one, end, as shown in Fig. 2, and yet without increasing the Weight of metal which would necessarily be employed ifthe clip was in the form of a tube of shorter length.

\Vhen the clip is made in the form illustrated in Fig. 1- or Fig. 2, it is only necessary. to cut a strip of'sufiic'ient width transversely and then bend the pieces severed from the strip to the form shown in the drawings.

VVithoutlirniting myself to the precise construction and arrangement of parts shown, I-

claim as my invention- 1. An anchoring-- piece for artificial dentu res consisting of a flat refractory-metal plate bent to an extent greater than-a half-circle but less thana complete circle and constituting a clip, substantially assetfortl1 2. The combination-in an artificial denture, of a body portion' of the denture of porcelain, and an anchoring-piece of platina baked set forth.

than a circle, substantially as set forth.

3. An anchoring-piece for an artificial denture consisting of a strip bent to an extent gr'eater'than ahalf-circle'but less than a circle provided with a projection 4, substantially as signed my presence of In testirnony whereof I have nameto'this specification in the two subscribing witnesses.

v v CHARLES FOSTER.

lVitnessesr i l, i

JAs, II. B AcKWoon, G.-"?."KRAMER.

' therein and consisting ofa strip uI metal bent V to an extent greater thanja half-circle but less 

